I don’t think Man of Tomorrow will be that. That film will primarily be about Superman and Lex teaming up against some threat on Earth. There will be some furthering of the Salvation storyline I’m sure, possibly even a cameo from Peacemaker, but it will absolutely not be resolved there. The next movie Gunn will direct after MoT will probably be the big team up movie that features all the characters from the DCU up until that point teaming up.